The amount of money carrying on international flight would depend your final destination of travel. It depends on the country you are traveling and as a tourist, on a worker visa, resident or citizen of that country. Ever country has their own regulation.
The rules are made by customs and immigration, not the airlines. Different countries have different rules.
On a side note, reporting requirements are not limited to cash dollars. The same requirements apply for various monetary instruments, including foreign currency, traveler’s checks, domestic or foreign bank notes, securities or stocks in bearer form.
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